Probably a ‘huh, guess we don’t need that guy after all’ situation… though at that point I’d ask, “Well, yes.. but you *hired* me.. does this mean I get two weeks severance?”.. it’s not being snarky, you might very well be eligible, depending.

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1: Extraordinary claims require extraordinary proof. If it does what it says, you should have no problem with this.
2: What proof will you accept that you are wrong? You ask us to change our mind, but we cannot change yours?
3: It is not our responsibility to disprove your claims, but rather your responsibility to prove them.
4. Personal testamonials are not proof.